The clock_getres() callback in struct k_clock is not year 2038 safe on 32bit systems.
To address this implement a new callback clock_getres64() which uses struct timespec64 along with a default implementation which is a wrapper for the existing clock_getres() callback. The default callback is installed at registration time for all posix clocks which are not yet converted to clock_getres64() and will be removed once this is completed.
Use the new callback in __clock_getres().
Signed-off-by: Baolin Wang baolin.wang@linaro.org --- include/linux/posix-timers.h | 1 + kernel/time/posix-timers.c | 31 ++++++++++++++++++++++++------- 2 files changed, 25 insertions(+), 7 deletions(-)
diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h index be2123d..35786c5 100644 --- a/include/linux/posix-timers.h +++ b/include/linux/posix-timers.h @@ -98,6 +98,7 @@ struct k_itimer {
struct k_clock { int (*clock_getres) (const clockid_t which_clock, struct timespec *tp); + int (*clock_getres64) (const clockid_t which_clock, struct timespec64 *tp); int (*clock_set) (const clockid_t which_clock, const struct timespec *tp); int (*clock_set64) (const clockid_t which_clock, diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c index a5207f0..0b0663a 100644 --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -603,6 +603,20 @@ static int default_clock_get64(const clockid_t which_clock, return ret; }
+static int default_clock_getres64(const clockid_t which_clock, + struct timespec64 *tp64) +{ + struct k_clock *kc = clockid_to_kclock(which_clock); + struct timespec tp; + int ret; + + ret = kc->clock_getres(which_clock, &tp); + if (!ret) + *tp64 = timespec_to_timespec64(tp); + + return 0; +} + void posix_timers_register_clock(const clockid_t clock_id, struct k_clock *new_clock) { @@ -617,8 +631,8 @@ void posix_timers_register_clock(const clockid_t clock_id, clock_id); return; } - if (!new_clock->clock_getres) { - printk(KERN_WARNING "POSIX clock id %d lacks clock_getres()\n", + if (!new_clock->clock_getres && !new_clock->clock_getres64) { + printk(KERN_WARNING "POSIX clock id %d lacks clock_getres() and clock_getres64()\n", clock_id); return; } @@ -631,6 +645,8 @@ void posix_timers_register_clock(const clockid_t clock_id, new_clock->clock_set64 = default_clock_set64; if (new_clock->clock_get && !new_clock->clock_get64) new_clock->clock_get64 = default_clock_get64; + if (new_clock->clock_getres && !new_clock->clock_getres64) + new_clock->clock_getres64 = default_clock_getres64;
posix_clocks[clock_id] = *new_clock; } @@ -678,7 +694,8 @@ static struct k_clock *clockid_to_kclock(const clockid_t id) return (id & CLOCKFD_MASK) == CLOCKFD ? &clock_posix_dynamic : &clock_posix_cpu;
- if (id >= MAX_CLOCKS || !posix_clocks[id].clock_getres) + if (id >= MAX_CLOCKS || (!posix_clocks[id].clock_getres + && !posix_clocks[id].clock_getres64)) return NULL; return &posix_clocks[id]; } @@ -1187,25 +1204,25 @@ SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock, return err; }
-static int __clock_getres(clockid_t which_clock, struct timespec *ts) +static int __clock_getres(clockid_t which_clock, struct timespec64 *ts) { struct k_clock *kc = clockid_to_kclock(which_clock);
if (!kc) return -EINVAL;
- return kc->clock_getres(which_clock, ts); + return kc->clock_getres64(which_clock, ts); }
SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct timespec __user *, tp) { - struct timespec rtn_tp; + struct timespec64 rtn_tp; int error;
error = __clock_getres(which_clock, &rtn_tp);
- if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp))) + if (!error && tp && put_timespec(&rtn_tp, tp)) error = -EFAULT;
return error;